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A plastic bar fit snugly between rigid supports at room temp. (68)but with no initial stress. When the temperature of a bar israised to 160 F the compressive stress on an inclined plane pqbecomes 1700 psi. a) What is the shear stress on the plane pq? alpha= 6x10^-6/F E=450x10^3 psi
Calculate the ionic packing factor for fcc NaCl. Take the atomic radii for Na and Cl as 0.097 and 0,181 nm respectively.
When the ambient air is at 70 degrees Fahreneit, 14.7 psia, and contains 21% oxygen by volume, 4.5 lb of air are pumped into a scuba tank, capacity 0.75 ft^3. What volume of ambient air was compressed
Reservoir A (water surface elevation = 1300 ft) is connected to reservoir B (water surface elevation=250 ft) by 6,000 ft of 14 inch diameter cast iron pipe (e = 0.005 ft. Neglecting all minor losses
If the coefficient of kinetic friction between the 12.5 mm diameter axles and the wheels is mu_k = .3, determine the radius of the wheels. neglect rolling resistance of the wheels on the surface.
Why is aluminum preferred over iron-based alloys in the aerospace industry and iron-based alloys over aluminum in structural numbers of bridges and buildings
A classroom that normally contains 40 people is to be air conditioned with window air conditioning units of 5 kW cooling capacity. A person at rest may be assumed to dissipate heat at a rate of about 360kJ/h
Each of the three partners realizes that in order for the firm to continue at the present rate of growth a realistic business continuation plan must be in place which would include a viable by-sell agreement between the shareholders.
A pipe line of 1.25 m diameter has a circular gate at its end. This gate can be operated around its horizontal diameter. If the pipe is flowing full with velocity almost equal to zero, calculate the turning moment required to operate the gate
An underground storage vault is to be constructed to serve as a detention pond for a heavily urbanized area. The walls of the vault will be vertical, but the flow will be sloped along its length to promote drainage.
The first pipe of 0.4-m diameter is 500 m long, the second pipe 600 m long, size 0.3 m, and the last pipe is 500 m long of diameter 0.2 m. If the elevation difference between two reservoirs is 30 m, calculate equivalent pipe size and flow in the p..
A glass jar is heated in an oven and sealed when the air pressure is 103 kPa and the temperature is 105 C. Find the absolute, gage, and vacuum pressures in the jar when it cools to 20 C.
How does aggregate size influence the coefficient of permeability of concrete? List other factors that determine the permeability of concrete in a structure.
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